The United States and Japan will step up their defence cooperation to deal with the threat from nuclear-armed North Korea as tensions in East Asia remain high, officials from the two allies said on Thursday.

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Victorian Health Minister David Davis said he hoped the circumstances in the case became clear through an independent review organised by Peninsula Health.

He said the government was considering a "version" of a concierge service - highlighted by some as one solution to ambulance delays.

A concierge service involves ambulance patients being left in the care of one paramedic in hospital before being admitted, allowing other ambulances to go back on the road and reduce ramping at hospitals.

"Our version of that is something that's under consideration," Mr Davis told ABC Radio.

Opposition health spokesman Gavin Jennings said such a system was just a "bandaid on an open wound".

Mr Jennings said the government needed to call a coronial inquest into the latest case and others where patients have died in ambulances.

He said the opposition had referred four cases to the coroner where a patient died in an ambulance when they should have been in hospital.

"The government has absolutely refused to join the opposition, to rise to the community expectations and to allow or call for a coronial inquest," he said.